1. Size and weight of steel structure
The size of the steel structure can be immersed in the zinc liquid at one time to achieve a uniform galvanized film structure, if it is too long or too wide, so that it must be divided into two dipping operators, the appearance of the zinc layer at the joint will appear rough, too thick and other bad. In addition, if the single weight of the steel structure is too heavy and exceeds the load of the galvanizing equipment, it will make its operation difficult. Therefore, communication with hot dip galvanizing plant in advance.
2, the material of steel structure
The material of steel structure will affect the structure and thickness of hot-dip galvanized skin film. If the high-tension steel contains silicon and carbon, it is easy to react quickly with molten zinc, and the result of excessive alloying growth will cause the appearance of gray and black, but it does not affect its corrosion resistance. Another example is heat treated steel, if its tensile strength exceeds 90kg/mm2, it is easy to reduce its strength after hot dipping operation.
3. Combination of dissimilar metals
For example, the combination of steel and copper, tin, lead and other non-ferrous metals, in the hot leaching operation, the dissolution of this non-metal will cause changes in the zinc film structure. Another example is the combination of new and old steel, in the pickling operation, the new material is easy to acid wash too much. In addition, excessive pickling at the processing site is also a problem if some components are processed.
The iron wire factory introduces the principle of hot dip galvanizing, which simply means that the cleaned iron parts are soaked in zinc bath after wetting, so that the steel reacts with molten zinc to form an alloyed skin film. Galvanized wire is the use of low carbon steel wire processing, through drawing forming, pickling rust removal, high temperature annealing, cooling and other processes. Galvanized wire is widely used.
Galvanized wire electroplating temperature should be controlled at 30 to 50℃. Because the chloride ions in the bath are very corrosive, quartz glass heaters are generally used. Continuous production does not require heating, but rather cooling. The cooling can be tightly lined thin-walled plastic pipes at the edge of the groove, cooled by running tap water, and titanium pipes can also be used as temperature control devices.
Post time: 18-04-24